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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type"></a><a class="link" href="lowest_layer_type.html" title="posix::stream_descriptor::lowest_layer_type">posix::stream_descriptor::lowest_layer_type</a>
</h4></div></div></div>
<p>
          <span class="emphasis"><em>Inherited from posix::descriptor.</em></span>
        </p>
<p>
          <a class="indexterm" name="asio.indexterm.posix__stream_descriptor.lowest_layer_type"></a> 
A
          descriptor is always the lowest layer.
        </p>
<pre class="programlisting">typedef descriptor lowest_layer_type;
</pre>
<h6>
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type.h0"></a>
          <span><a name="asio.reference.posix__stream_descriptor.lowest_layer_type.types"></a></span><a class="link" href="lowest_layer_type.html#asio.reference.posix__stream_descriptor.lowest_layer_type.types">Types</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/bytes_readable.html" title="posix::descriptor::bytes_readable"><span class="bold"><strong>bytes_readable</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    IO control command to get the amount of data that can be read
                    without blocking.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/executor_type.html" title="posix::descriptor::executor_type"><span class="bold"><strong>executor_type</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    The type of the executor associated with the object.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/lowest_layer_type.html" title="posix::descriptor::lowest_layer_type"><span class="bold"><strong>lowest_layer_type</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    A descriptor is always the lowest layer.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/native_handle_type.html" title="posix::descriptor::native_handle_type"><span class="bold"><strong>native_handle_type</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    The native representation of a descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/wait_type.html" title="posix::descriptor::wait_type"><span class="bold"><strong>wait_type</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Wait types.
                  </p>
                </td>
</tr>
</tbody>
</table></div>
<h6>
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type.h1"></a>
          <span><a name="asio.reference.posix__stream_descriptor.lowest_layer_type.member_functions"></a></span><a class="link" href="lowest_layer_type.html#asio.reference.posix__stream_descriptor.lowest_layer_type.member_functions">Member
          Functions</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/assign.html" title="posix::descriptor::assign"><span class="bold"><strong>assign</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Assign an existing native descriptor to the descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/async_wait.html" title="posix::descriptor::async_wait"><span class="bold"><strong>async_wait</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Asynchronously wait for the descriptor to become ready to read,
                    ready to write, or to have pending error conditions.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/cancel.html" title="posix::descriptor::cancel"><span class="bold"><strong>cancel</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Cancel all asynchronous operations associated with the descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/close.html" title="posix::descriptor::close"><span class="bold"><strong>close</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Close the descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/descriptor.html" title="posix::descriptor::descriptor"><span class="bold"><strong>descriptor</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Construct a descriptor without opening it. <br> <span class="silver"> &#8212;</span><br> Construct
                    a descriptor on an existing native descriptor. <br> <span class="silver"> &#8212;</span><br>
                    Move-construct a descriptor from another.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/get_executor.html" title="posix::descriptor::get_executor"><span class="bold"><strong>get_executor</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Get the executor associated with the object.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/get_io_context.html" title="posix::descriptor::get_io_context"><span class="bold"><strong>get_io_context</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    (Deprecated: Use get_executor().) Get the io_context associated
                    with the object.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/get_io_service.html" title="posix::descriptor::get_io_service"><span class="bold"><strong>get_io_service</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    (Deprecated: Use get_executor().) Get the io_context associated
                    with the object.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/io_control.html" title="posix::descriptor::io_control"><span class="bold"><strong>io_control</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Perform an IO control command on the descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/is_open.html" title="posix::descriptor::is_open"><span class="bold"><strong>is_open</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Determine whether the descriptor is open.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/lowest_layer.html" title="posix::descriptor::lowest_layer"><span class="bold"><strong>lowest_layer</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Get a reference to the lowest layer. <br> <span class="silver"> &#8212;</span><br> Get a const
                    reference to the lowest layer.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/native_handle.html" title="posix::descriptor::native_handle"><span class="bold"><strong>native_handle</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Get the native descriptor representation.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/native_non_blocking.html" title="posix::descriptor::native_non_blocking"><span class="bold"><strong>native_non_blocking</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Gets the non-blocking mode of the native descriptor implementation.
                    <br> <span class="silver"> &#8212;</span><br> Sets the non-blocking mode of the native descriptor
                    implementation.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/non_blocking.html" title="posix::descriptor::non_blocking"><span class="bold"><strong>non_blocking</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Gets the non-blocking mode of the descriptor. <br> <span class="silver"> &#8212;</span><br> Sets
                    the non-blocking mode of the descriptor.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/operator_eq_.html" title="posix::descriptor::operator="><span class="bold"><strong>operator=</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Move-assign a descriptor from another.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/release.html" title="posix::descriptor::release"><span class="bold"><strong>release</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Release ownership of the native descriptor implementation.
                  </p>
                </td>
</tr>
<tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/wait.html" title="posix::descriptor::wait"><span class="bold"><strong>wait</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Wait for the descriptor to become ready to read, ready to write,
                    or to have pending error conditions.
                  </p>
                </td>
</tr>
</tbody>
</table></div>
<h6>
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type.h2"></a>
          <span><a name="asio.reference.posix__stream_descriptor.lowest_layer_type.protected_member_functions"></a></span><a class="link" href="lowest_layer_type.html#asio.reference.posix__stream_descriptor.lowest_layer_type.protected_member_functions">Protected
          Member Functions</a>
        </h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                  <p>
                    Name
                  </p>
                </th>
<th>
                  <p>
                    Description
                  </p>
                </th>
</tr></thead>
<tbody><tr>
<td>
                  <p>
                    <a class="link" href="../posix__descriptor/_descriptor.html" title="posix::descriptor::~descriptor"><span class="bold"><strong>~descriptor</strong></span></a>
                  </p>
                </td>
<td>
                  <p>
                    Protected destructor to prevent deletion through this type.
                  </p>
                </td>
</tr></tbody>
</table></div>
<p>
          The <a class="link" href="../posix__descriptor.html" title="posix::descriptor"><code class="computeroutput">posix::descriptor</code></a>
          class template provides the ability to wrap a POSIX descriptor.
        </p>
<h6>
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type.h3"></a>
          <span><a name="asio.reference.posix__stream_descriptor.lowest_layer_type.thread_safety"></a></span><a class="link" href="lowest_layer_type.html#asio.reference.posix__stream_descriptor.lowest_layer_type.thread_safety">Thread
          Safety</a>
        </h6>
<p>
          <span class="emphasis"><em>Distinct</em></span> <span class="emphasis"><em>objects:</em></span> Safe.
        </p>
<p>
          <span class="emphasis"><em>Shared</em></span> <span class="emphasis"><em>objects:</em></span> Unsafe.
        </p>
<h6>
<a name="asio.reference.posix__stream_descriptor.lowest_layer_type.h4"></a>
          <span><a name="asio.reference.posix__stream_descriptor.lowest_layer_type.requirements"></a></span><a class="link" href="lowest_layer_type.html#asio.reference.posix__stream_descriptor.lowest_layer_type.requirements">Requirements</a>
        </h6>
<p>
          <span class="emphasis"><em>Header: </em></span><code class="literal">asio/posix/stream_descriptor.hpp</code>
        </p>
<p>
          <span class="emphasis"><em>Convenience header: </em></span><code class="literal">asio.hpp</code>
        </p>
</div>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div></td>
</tr></table>
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